[Devel] C/R: Fixup IPv6 support

[Dan Smith]

This set enables checkpointing network interfaces that have IPv6 
addresses, as well as brings back the bits necessary for IPv6 sockets
to work.

With this, I can migrate an sshd with active IPv4 and IPv6 connections.
It also makes general testing easier because sshd will open an IPv6
socket if the kernel supports it which, until this patch, meant
that IPv6 must have been disabled in the kernel for sshd to be migratable.

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